东风吹

由于Swift2与Swift3之间有好多语法修正，所以刚入学还是比较蛋疼。网上查了一些资料，罗表以下备用：

CGRect

Swift 2:

let frame = CGRectMake(0, 0, 20, 20)
Swift 3:

let frame = CGRect(x: 0, y: 0, width: 20, height: 20)
CGPoint

Swift 2:

let point = CGPointMake(0, 0)
Swift 3:

let point = CGPoint(x: 0, y: 0)
CGSize

Swift 2:

let size = CGSizeMake(20, 20)
Swift 3:

let size = CGSize(width: 20, height: 20)
CGRectGetMidX

Swift 2:

CGRectGetMidX(view)
Swift 3:

view.midX
CGRectGetMidY

Swift 2:

CGRectGetMidY(view)
Swift 3:

view.midY
UIColor

Swift 2:

let color = UIColor.redColor()
Swift 3:

let color = UIColor.red
“NS”

Swift 2:

NSTimer
NSData
NSError
Swift 3:

Timer
Data
Error
UserDefaults

Swift 2:

NSUserDefaults.standardUserDefaults().//something
Swift 3:

UserDefaults.standard.//something